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Vishay General Semiconductor - Diodes Division SMAJ75A-M3/61
- Part No.:
- SMAJ75A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75A-M3/61.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,760
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Product details
Overview
SMAJ75A-M3/61 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 75 V standoff voltage (VWM), 83.3–92.1 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤121 V at 3.3 A peak pulse current (IPPM), with 400 W peak pulse power rating (10/1000 μs waveform). It is widely deployed in automotive power line protection, industrial sensor interfaces, and DC power rail surge suppression.
For engineers reviewing the SMAJ75A-M3/61 datasheet, SMAJ75A-M3/61 pinout, SMAJ75A-M3/61 application, or SMAJ75A-M3/61 equivalent, key selection criteria include its unidirectional polarity, SMA (DO-214AC) package compatibility with automated SMT assembly, AEC-Q101 qualification readiness (via HM3 suffix variants), and precise clamping behavior under repetitive surge conditions.
Technical Context
This TVS diode operates as a voltage-clamping device in series with protected circuitry, conducting only when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable leakage performance (<1.0 μA at 75 V) and fast response time (<1.0 ps), enabling effective suppression of ESD, lightning-induced surges, and inductive switching transients.
The device is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine) and operates across –55 °C to +150 °C junction temperature range. Thermal resistance is 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads, supporting reliable operation in compact, thermally constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 75 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 83.3–92.1 V at 1.0 mA - Confirmed minimum/maximum reverse breakdown range; ensures predictable turn-on across production lot. |
| VC (Clamping Voltage) | ≤121 V at IPPM = 3.3 A (10/1000 μs) - Peak voltage seen by protected IC during surge; directly limits stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W - Surge energy handling capability under standardized 10/1000 μs waveform; derates to 300 W above 78 V per spec. |
| IFSM (Surge Current) | 40 A - Single half-sine (8.3 ms) forward surge rating; supports protection against high-energy inductive kickback events. |
| TJmax | +150 °C - Maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with cathode band marking; compatible with JEDEC MS-013 and IPC-7351B footprints. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 (260 °C reflow peak), RoHS-compliant and halogen-free (M3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Protected circuit side (anode connected to ground or return path) | Reverse-biased during normal operation; conducts avalanche current when VREV > VBR to clamp transient voltage. |
| Anode | Ground or low-impedance return path | Provides low-inductance discharge path for surge current; must be routed with minimal loop area to preserve clamping efficacy. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables single-device protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges without external series impedance. |
| Glass passivated junction | Ensures stable VBR tolerance and <1.0 μA leakage at VWM, critical for low-power sensor and battery-backed circuits. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD), improving clamping precision versus silicon carbide alternatives. |
| AEC-Q101 qualification option | HM3 suffix variants are qualified for automotive applications, supporting design-in for engine control units and ADAS power rails. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profiles without baking, reducing manufacturing overhead in high-volume SMT lines. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground, clamping transients before they reach LDOs or microcontrollers. Use Value: Clamps to ≤121 V at 3.3 A, staying within safe operating area of 16 V-rated input regulators and preventing latch-up in downstream logic. |
Use Scenario: Shielding 4–20 mA current-loop transmitters and analog sensor outputs from field wiring surges. IC Role / Device Role / Timing Role: Reverse-biased TVS across signal and return lines, absorbing induced common-mode transients without affecting DC accuracy. Use Value: Leakage <1.0 μA at 75 V preserves loop accuracy; fast response prevents signal corruption during sub-microsecond ESD events. |
| DC Power Rail Surge Suppression | Consumer Electronics Port Protection |
|
Use Scenario: Safeguarding 24 V industrial PLC I/O modules against inductive switching spikes from solenoids and relays. IC Role / Device Role / Timing Role: Primary clamping device on VCC rail, coordinated with upstream fuse or PTC for fault isolation. Use Value: 40 A IFSM rating handles repeated relay coil de-energization surges; 120 °C/W RθJA allows thermal management on standard FR-4. |
Use Scenario: Adding secondary surge immunity to USB-C or barrel jack inputs in portable medical monitors and smart home hubs. IC Role / Device Role / Timing Role: Standoff-rated TVS on input stage, acting after primary MOV or GDT but before linear regulator or buck converter. Use Value: 75 V VWM accommodates 24 V nominal adapters while providing tighter clamping than higher-voltage variants, reducing stress on downstream FETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75A-E3/61 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3). | Preferred for commercial-grade applications where halogen-free compliance is not mandated. | Select E3 for cost-sensitive industrial designs; M3 required for automotive or green-certified products. |
| SMAJ78A-M3/61 | Higher VWM (78 V), VBR (86.7–95.8 V), and VC (≤126 V); same package and power rating. | Better suited for 24 V systems with wider supply tolerance or higher surge immunity margins. | Choose SMAJ78A-M3/61 when system VMAX exceeds 75 V but clamping headroom remains acceptable. |
Compared with SMAJ75A-M3/61, the E3 variant trades halogen-free status for lower cost without sacrificing surge performance, while SMAJ78A-M3/61 offers increased standoff margin at the expense of slightly higher clamping voltage-critical for 24 V rail designs needing tighter VWM/VBR ratio control.
Availability
SMAJ75A-M3/61 is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface protection, and DC power rail surge suppression requiring stable component supply, halogen-free compliance, and AEC-Q101-ready qualification pathways.
Supply support for SMAJ75A-M3/61 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where robustness, consistency, and long-term availability are mandatory.
FAQ
What is the maximum clamping voltage of SMAJ75A-M3/61 under standard test conditions?
The SMAJ75A-M3/61 has a maximum clamping voltage (VC) of 121 V when subjected to a 10/1000 μs waveform at a peak pulse current (IPPM) of 3.3 A. This value is measured per ANSI/IEEE C62.35 standards and reflects the upper limit of voltage imposed on protected circuitry during surge events. The SMAJ75A-M3/61 maintains this clamping performance across its full operating temperature range.
Is SMAJ75A-M3/61 suitable for automotive applications?
SMAJ75A-M3/61 itself is not AEC-Q101 qualified, but it shares identical electrical and mechanical specifications with the AEC-Q101-qualified HM3-suffix variants (e.g., SMAJ75AHM3_A/H). Its halogen-free, RoHS-compliant construction, 150 °C junction rating, and robust surge capability make it a direct candidate for automotive design-in when paired with HM3 ordering codes. The SMAJ75A-M3/61 serves as the commercial-grade baseline for automotive-grade derivatives.
How does the M3 suffix differ from E3 in SMAJ75A-M3/61?
The M3 suffix denotes a halogen-free, RoHS-compliant version meeting JESD201 Class 2 whisker resistance requirements, whereas E3 is RoHS-compliant but contains halogens. Both share identical electrical characteristics, package dimensions, and thermal performance. The SMAJ75A-M3/61 is specified for environmentally regulated markets including EU automotive supply chains and green-certified industrial equipment where halogen content restrictions apply.
What is the thermal resistance of SMAJ75A-M3/61 in typical PCB mounting?
The SMAJ75A-M3/61 exhibits a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, per Vishay's recommended layout. Its junction-to-lead resistance (RθJL) is 30 °C/W, supporting efficient heat transfer to PCB copper. These values enable reliable operation up to +150 °C junction temperature in thermally constrained layouts without forced cooling.
Can SMAJ75A-M3/61 be used in bidirectional configurations?
No-SMAJ75A-M3/61 is strictly unidirectional, indicated by the "A" suffix and cathode band marking. Bidirectional operation requires the "CA" suffix (e.g., SMAJ75CA). Using SMAJ75A-M3/61 in reverse-biased AC or floating signal paths will result in forward conduction and potential failure. For bidirectional protection at 75 V standoff, specify SMAJ75CA-M3/61 instead.
SMAJ75A-M3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 3.3A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ75A-M3/61 FAQ
1.How can I place an order for SMAJ75A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75A-M3/61 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMAJ75A-M3/61 reliable?
The price and inventory of SMAJ75A-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ75A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75A-M3/61?
SMAJ75A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75A-M3/61 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMAJ75A-M3/61?
For technical support, including SMAJ75A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75A-M3/61 requirements.
6.How does Aetrix verify that SMAJ75A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ75A-M3/61 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMAJ75A-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ75A-M3/61?
All SMAJ75A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75A-M3/61, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMAJ75A-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ75A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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